反转文本并找到相同的单词-python

Question

I have to write some code in python that will read all words from a text, reverse them and find which of them are the same in normal and reverse format. So far, I 've done this:

filename=raw_input("enter the file name: ")
fop=open(filename)
for line in fop:
  words=line.split()
li=[]
li.extend(words)
size=len(li)
for i in range(0,size/2):
    li[i], li[size-1-i] = li[size-1-i], li[i]
`enter code here`''.join(li)

but it doesn 't work, because if i give a text with more than one lines, it only processes the last line and doesn 't actually seem to reverse anything. Some help please?

Answer 1

You can just do the following , you can check for reverse with word == word[::-1] that word[::-1] is reverse indexing :

filename=raw_input("enter the file name: ")
with open(filename) as f :
    for line in f:
       for word in line.split() :
           if word == word[::-1]:
               print word

Answer 2

If you want to print just once the palindrome words you can use a set comprehension

print '\n'.join({w for w in open('file.txt).read().split() if w==w[::-1]})

Note that my answer doesn't filter any single letters, punctuation etc, in other words it depends on a loose and broad definition of what is a word.